ST TDA7296 User Manual

TDA7296

70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

1 FEATURES

■MULTIPOWER BCD TECHNOLOGY

■VERY HIGH OPERATING VOLTAGE RANGE (±35V)

■DMOS POWER STAGE

■HIGH OUTPUT POWER (UP TO 60W MUSIC POWER)

■MUTING/STAND-BY FUNCTIONS

■NO SWITCH ON/OFF NOISE

■NO BOUCHEROT CELLS

■VERY LOW DISTORTION

■VERY LOW NOISE

■SHORT CIRCUIT PROTECTION

■THERMAL SHUTDOWN

2 DESCRIPTION

The TDA7296 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV).

Figure 2. Typical Application and Test Circuit

Figure 1. Package

Multiwatt15V	Multiwatt15H
	(Short Leads)

Table 1. Order Codes

Part Number	Package
TDA7296	Multiwatt15V
TDA7296HS	Multiwatt15H (Short Leads)

Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation, with high Supply Voltage Rejection.

The built in muting function with turn on delay simplifies the remote operation avoiding switching onoff noises.

			C7 100nF		+Vs	C6 1000µF
			R3 22K
C2				+Vs		+PWVs
	R2			7		13
22µF
	680Ω	IN-	2
			-			14	OUT
	C1 470nF
		IN+	3
							C5
			+
R1 22K							22µF
						6
	IN+MUTE		4				BOOT-
								R6
							STRAP
								2.7Ω
	R5 10K	MUTE	10
VM
		STBY	MUTE	THERMAL		S/C
			9					C10
VSTBY				SHUTDOWN	PROTECTION
			STBY					100nF
R4 22K
			1	8	15
C3 10µF			STBY-GND	-Vs	-PWVs
			C4 10µF
				C9 100nF		C8 1000µF
					-Vs		D93AU011
Note: The Boucherot cell R6, C10, normally not necessary for a stable operation it could
be needed in presence of particular load impedances at VS <±25V.

Rev. 10

February 2005

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TDA7296

Figure 3. Pin Connection

Table 2. Absolute Maximum Ratings

Symbol	Parameter	Value	Unit
VS	Supply Voltage (No Signal)	±35	V
IO	Output Peak Current	5	A
Ptot	Power Dissipation Tcase = 70°C	50	W
Top	Operating Ambient Temperature Range	0 to 70	°C
Tstg, Tj	Storage and Junction Temperature	150	°C

Table 3. Thermal Data

Symbol	Parameter	Typ.	Max	Unit
Rth j-case	Thermal Resistance Junction-case	1	1.5	°C/W

Figure 4. Block Diagram

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TDA7296

Table 4. Electrical Characteristcs (Refer to the Test Circuit VS = ±24V, RL = 8Ω, GV = 30dB; Rg = 50Ω; Tamb = 25°C, f = 1 kHz; unless otherwise specified).

Symbol		Parameter		Test Condition	Min.	Typ.	Max.	Unit
VS		Supply Range			±10		±35	V
Iq		Quiescent Current			20	30	65	mA
Ib		Input Bias Current					500	nA
VOS		Input Offset Voltage			-10		10	mV
IOS		Input Offset Current			-100		100	nA
PO		RMS Continuous Output		d = 05%
		Power		VS = ± 24V, RL = 8Ω;	27	30		W
				VS = ± 21V, RL = 6Ω;	27	30		W
				VS = ± 18V, RL = 4Ω;	27	30		W
		Music Power (RMS)		d = 10%
		∆t = 1s (*)		VS = ± 29V, RL = 8Ω;		60		W
				VS = ± 24V, RL = 6Ω;		60		W
				VS = ± 22V, RL = 4Ω;		60		W
d		Total Harmonic Distortion (**)		PO = 5W; f = 1kHz		0.005	0.1	%
				PO = 0.1 to 20W; f = 20Hz to 20kHz
				VS = ± 18V, RL = 4Ω;		0.01		%
				PO = 5W; f = 1kHz
				PO = 0.1 to 20W; f = 20Hz to 20kHz			0.1	%
SR		Slew Rate			7	10		V/µs
GV		Open Loop Voltage Gain				80		dB
GV		Closed Loop Voltage Gain (1)			24	30	40	dB
eN		Total Input Noise		A = curve		1		µV
				f = 20Hz to 20kHz		2	5	µV
fL ,fH		frequency response (-3dB)		PO =1W		20Hz to 20kHz
Ri		Input Resistance			100			kΩ
SVR		Supply Voltage Rejection		f = 100Hz; Vripple = 0.5Vrms	60	75		dB
TS		Thermal Shutdown				145		°C
STAND-BY FUNCTION (Ref: -Vs or GND)
VST on		Stand-by on Threshold					1.5	V
VST off		Stand-by off Threshold			3.5			V
ATTst-by		Stand-by Attenuation			70	90		dB
Iq st-by		Quiescent Current @ Stand-by				1	3	mA
MUTE FUNCTION (Ref: -Vs ro GND)
VMon		Mute on Threshold					1.5	V
VMoff		Mute off Threshold			3.5			V
ATTmute		Mute AttenuatIon			60	80		dB

Note (*):

MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz.

Note (**): Tested with optimized Application Board (see fig.5)

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TDA7296

Figure 5. P.C.B. and Components Layout of the Circuit of figure 2.

Note:

The Stand-by and Mute functions can be referred either to GND or -VS.

On the P.C.B. is possible to set both the configuration through the jumper J1.

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TDA7296

3 APPLICATION SUGGESTIONS

(see Test and Application Circuits of the Fig. 2)

The recommended values of the external components are those shown on the application circuit of Figure 2. Different values can be used; the following table can help the designer.

	COMPONENTS	SUGGESTED	PURPOSE		LARGER THAN	SMALLER THAN
		VALUE			SUGGESTED	SUGGESTED
	R1 (*)	22k	Input Resistance		Increase Input	Decrease Input
					Impedance	Impedance
	R2	680Ω	Closed Loop Gain		Decrease of Gain	Increase of Gain
			Set to 30db (**)
	R3 (*)	22k			Increase of Gain	Decrease of Gain
	R4	22k	St-by Time Constant		Larger St-by	Smaller St-by ON/OFF
					ON/OFF Time	Time; Pop Noise
	R5	10k	Mute Time Constant		Larger Mute	Smaller Mute
					ON/OFF Time	ON/OFF Time
	C1	0.47µF	Input DC Decoupling			Higher Low Frequency
						Cutoff
	C2	22µF	Feedback DC			Higher Low Frequency
			Decoupling			Cutoff
	C3	10µF	Mute Time Constant		Larger Mute	Smaller Mute ON/OFF
					ON/OFF Time	Time
	C4	10µF	St-by Time Constant		Larger St-by	Smaller St-by ON/OFF
					ON/OFF Time	Time; Pop Noise
	C5	22µF	Bootstrapping			Signal Degradation at
						Low Frequency
	C6, C8	1000µF	Supply Voltage Bypass			Danger of Oscillation
	C7, C9	0.1µF	Supply Voltage Bypass			Danger of Oscillation

(*) R1 = R3 for pop optimization

(**) Closed Loop Gain has to be ≥ 24dB

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